Nanoka no Kyofu

One morning, when he woke up, Saburo found himself suspended in an empty void, his own room nowhere to be seen. The next day, land and stars would appear, and the day after that, the sea. And on the seventh day, Saburo realized that the world he had been in had already been erased, and now everything was in the process of being recreated.

Note: published in Deluxe Shounen Sunday 1969/11